Amplifier coupling on a reduced area

Abstract

The invention discloses an amplifier ( 200, 400, 500 ) coupling comprising a first ( 230 ), a second ( 240 ), a third ( 250 ) and a fourth ( 260 ) transistor, additionally comprising a signal input port ( 220 ) and a signal output port ( 210, 410 ). The input port of the amplifier is connected to the first, second, third and fourth transistors such that an input signal to the amplifier is input to the first and the fourth transistor in parallel, and to the second and third transistors in parallel, with the outputs from the first and second transistors being connected in series to each other, and the outputs from the fourth and third transistors being connected in series with each other, said outputs being connected in parallel to each to the one output port of the amplifier.

1. An amplifier coupling, comprising a first, a second, a third and a fourth transistor, additionally comprising a signal input port and a signal output port, wherein the input port of the amplifier is connected to the first, second, third and fourth transistors such that an input signal to the amplifier is input to the first and the fourth transistor in parallel and to the second and third transistors in parallel, with the outputs from the first and second transistors being connected to each other at a first output common point, and the outputs from the fourth and third transistors being connected with each other at a second common output point, said first and second common output points being connected to each other to form the output port of the amplifier;
 wherein the inputs to the first and fourth transistors are from a first common input point in the amplifier, said first common input point being connected to a second common input point from which the input signal is input to the second and third transistors. 
 
     
     
       2. The amplifier of  claim 1 , wherein the signal input port of the amplifier is connected to each of the first, second, third and fourth transistors such that an input signal is input to the first and the fourth transistor with a first phase and to the second and third transistor with a second phase, said first and second phases being different from each other, and the signal output port of the amplifier is connected to the first, second, third and fourth transistors such that signals output from the first, second, third and fourth transistors reach the output port of the amplifier with essentially one and the same phase. 
     
     
       3. The amplifier of  claim 2 , wherein the signals from the first, second, third and fourth transistors reach the output port of the amplifier with essentially one and the same phase by virtue of the fact that the electrical length from the first common input point to the second common input point is equal to the electrical length from the output of the first transistor to the output of the second transistor and also equal to the electrical length from the output of the third transistor to the output of the fourth transistor.